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main.go
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main.go
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// Mounts a FUSE filesystem backed by torrents and magnet links.
package main
import (
"flag"
"log"
"net"
"net/http"
_ "net/http/pprof"
"os"
"os/signal"
"os/user"
"path/filepath"
"syscall"
"time"
"bazil.org/fuse"
fusefs "bazil.org/fuse/fs"
_ "github.com/anacrolix/envpprof"
"github.com/anacrolix/torrent"
"github.com/anacrolix/torrent/fs"
"github.com/anacrolix/torrent/util/dirwatch"
)
var (
torrentPath = flag.String("torrentPath", func() string {
_user, err := user.Current()
if err != nil {
log.Fatal(err)
}
return filepath.Join(_user.HomeDir, ".config/transmission/torrents")
}(), "torrent files in this location describe the contents of the mounted filesystem")
downloadDir = flag.String("downloadDir", "", "location to save torrent data")
mountDir = flag.String("mountDir", "", "location the torrent contents are made available")
disableTrackers = flag.Bool("disableTrackers", false, "disables trackers")
testPeer = flag.String("testPeer", "", "the address for a test peer")
readaheadBytes = flag.Int64("readaheadBytes", 10*1024*1024, "bytes to readahead in each torrent from the last read piece")
listenAddr = flag.String("listenAddr", ":6882", "incoming connection address")
testPeerAddr *net.TCPAddr
)
func resolveTestPeerAddr() {
if *testPeer == "" {
return
}
var err error
testPeerAddr, err = net.ResolveTCPAddr("tcp4", *testPeer)
if err != nil {
log.Fatal(err)
}
}
func exitSignalHandlers(fs *torrentfs.TorrentFS) {
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
for {
<-c
fs.Destroy()
err := fuse.Unmount(*mountDir)
if err != nil {
log.Print(err)
}
}
}
func addTestPeer(client *torrent.Client) {
for _, t := range client.Torrents() {
if testPeerAddr != nil {
if err := t.AddPeers([]torrent.Peer{{
IP: testPeerAddr.IP,
Port: testPeerAddr.Port,
}}); err != nil {
log.Print(err)
}
}
}
}
func main() {
flag.Parse()
if flag.NArg() != 0 {
os.Stderr.WriteString("one does not simply pass positional args\n")
os.Exit(2)
}
if *mountDir == "" {
os.Stderr.WriteString("y u no specify mountpoint?\n")
os.Exit(2)
}
log.SetFlags(log.LstdFlags | log.Lshortfile)
conn, err := fuse.Mount(*mountDir)
if err != nil {
log.Fatal(err)
}
defer fuse.Unmount(*mountDir)
// TODO: Think about the ramifications of exiting not due to a signal.
defer conn.Close()
client, err := torrent.NewClient(&torrent.Config{
DataDir: *downloadDir,
DisableTrackers: *disableTrackers,
ListenAddr: *listenAddr,
NoUpload: true, // Ensure that downloads are responsive.
})
if err != nil {
log.Fatal(err)
}
// This is naturally exported via GOPPROF=http.
http.DefaultServeMux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
client.WriteStatus(w)
})
dw, err := dirwatch.New(*torrentPath)
if err != nil {
log.Fatal(err)
}
go func() {
for ev := range dw.Events {
switch ev.Change {
case dirwatch.Added:
if ev.TorrentFilePath != "" {
_, err := client.AddTorrentFromFile(ev.TorrentFilePath)
if err != nil {
log.Printf("error adding torrent to client: %s", err)
}
} else if ev.MagnetURI != "" {
_, err := client.AddMagnet(ev.MagnetURI)
if err != nil {
log.Printf("error adding magnet: %s", err)
}
}
case dirwatch.Removed:
T, ok := client.Torrent(ev.InfoHash)
if !ok {
break
}
T.Drop()
}
}
}()
resolveTestPeerAddr()
fs := torrentfs.New(client)
go exitSignalHandlers(fs)
go func() {
for {
addTestPeer(client)
time.Sleep(10 * time.Second)
}
}()
if err := fusefs.Serve(conn, fs); err != nil {
log.Fatal(err)
}
<-conn.Ready
if err := conn.MountError; err != nil {
log.Fatal(err)
}
}